DBA_HIST_LATCH_MISSES_SUMMARY

DBA_HIST_LATCH_MISSES_SUMMARY displays historical summary statistics about missed attempts to acquire a latch.

This view contains snapshots of V$LATCH_MISSES.

Column	Datatype	NULL	Description
SNAP_ID	NUMBER	NOT NULL	Unique snapshot ID
DBID	NUMBER	NOT NULL	Database ID for the snapshot
INSTANCE_NUMBER	NUMBER	NOT NULL	Instance number for the snapshot
PARENT_NAME	VARCHAR2(64)	NOT NULL	Latch name of a parent latch
WHERE_IN_CODE	VARCHAR2(80)	NOT NULL	Location that attempted to acquire the latch
NWFAIL_COUNT	NUMBER		Number of times that no-wait acquisition of the latch failed
SLEEP_COUNT	NUMBER		Number of times that acquisition attempts caused sleeps
WTR_SLP_COUNT	NUMBER		Number of times a waiter slept
CON_DBID	NUMBER		The database ID of the PDB for the sampled session
CON_ID	NUMBER		The ID of the container that CON_DBID identifies. Possible values include: 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs. 1: This value is used for rows containing data that pertain to only the root n: Where n is the applicable container ID for the rows containing data

See Also: “V$LATCH_MISSES”